import datetime

from django.test import TestCase

# Create your tests here.
from django.urls import reverse
from django.utils import timezone

from polls.models import Question


class QuestionModelTests(TestCase):
    def test_was_published_recently_with_future_question(self):
        """
        对于发布日期在未来的问题返回False- 运行测试脚本： python manage.py test polls
        :return:
        """
        time = timezone.now() + datetime.timedelta(days=30)
        future_question = Question(pub_date=time)
        self.assertIs(future_question.was_published_recently(), False)

    def test_was_published_recently_with_old_question(self):
        """
        对于pub_date 大于1天的问题返回False。
        :return:
        """
        time = timezone.now() - datetime.timedelta(days=1, seconds=1)
        old_question = Question(pub_date=time)
        self.assertIs(old_question.was_published_recently(), False)

    def test_was_published_recently_with_recent_question(self):
        """
        对于 pub_date 在最后一天内的问题返回 True
        :return:
        """
        time = timezone.now() - datetime.timedelta(hours=23, minutes=59, seconds=59)
        recent_question = Question(pub_date=time)
        self.assertIs(recent_question.was_published_recently(), True)


def create_question(question_text, days):
    """
    使用给定的“question_text”创建一个问题，并发布到现在偏移的给定“天”数（过去发布的问题为负数，尚未发布的问题为正数）。
    :param days:
    :return:
    """
    time = timezone.now() + datetime.timedelta(days=days)
    return Question.objects.create(question_text=question_text, pub_date=time)


class QuestionIndexViewTests(TestCase):
    " 如果不存在任何问题，则会显示相应的消息。"
    def test_no_questions(self):
        response = self.client.get(reverse('polls:index'))
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, '没有可用的民意调查')
        self.assertQuerysetEqual(response.context['latest_question_list'], [])

    def test_past_question(self):
        """ 过去 pub_date 的问题会显示在索引页面上。 """
        question = create_question(question_text='过去的问题', days=30)
        response = self.client.get(reverse('polls:index'))
        self.assertQuerysetEqual(
            response.context['latest_question_list'],
            [question],
        )

    def test_future_question(self):
        """ 未来有 pub_date 的问题不会显示在索引页。 """
        create_question(question_text='未来的问题', days=30)
        response = self.client.get(reverse('polls:index'))
        self.assertContains(response, '没有可用的民意调查')
        self.assertQuerysetEqual(response.context['latest_question_list'], [])

    def test_future_question_and_question(self):
        """ 即使过去和未来的问题都存在，也只显示过去的问题 """
        question = create_question(question_text='过去的问题', days=-30)
        create_question(question_text='未来的问题', days=30)
        response = self.client.get(reverse('pols:index'))
        self.assertQuerysetEqual(
            response.context['latest_question_list'],
            [question],
        )

    def test_two_past_questions(self):
        """ 问题索引页面可能会显示多个问题。 """
        question1 = create_question(question_text='过去的问题 1', days=-30)
        question2 = create_question(question_text='过去的问题 2', days=-5)
        response = self.client.get(reverse('polls:index'))
        self.assertQuerysetEqual(
            response.context['latest_question_list'],
            [question2, question1]
        )


class QuestionDetailViewTests(TestCase):
    def test_future_question(self):
        """ 未来带有 pub_date 的问题的详细视图返回 404 not found。 """
        future_question = create_question(question_text='未来的问题', days=5)
        url = reverse('polls:detail', args=(future_question.id,))
        response = self.client.get(url)
        self.assertEqual(response.status_code, 404)

    def test_past_question(self):
        """ 过去具有 pub_date 的问题的详细视图显示问题的文本 """
        past_question = create_question(question_text='过去的问题', days=-5)
        url = reverse('polls:detail', args=(past_question.id,))
        response = self.client.get(url)
        self.assertContains(response, past_question.question_text)




